From Longman Dictionary of Contemporary Englishwelchwelch /welʃ $ welʃ, weltʃ/ verb [intransitive] x-refanother spelling of welsh2→ See Verb table
Examples from the Corpus
welch• I don't welch on my bargains, I really don't!From Longman Business Dictionarywelchwelch /welʃwelʃ, weltʃ/ (also welsh) verb [intransitive] informal if someone welches on a deal, they fail to do what they promised toIf they welch on this agreement, who will want to deal with them in future?→ See Verb tableOrigin welch (1800-1900) Probably from Welsh 